/Engine/Plugins/Online/OnlineSubsystem/Source/Public/Interfaces/OnlineTurnBasedInterface.h
End the turn and upload MatchData. EndTurnCallback is called once the data is uploaded (or failed), with a (bool) Success parameter
virtual void EndTurnWithMatchData ( const [TArray](API\Runtime\Core\Containers\TArray)< uint8 > & MatchData, int32 TurnTimeoutInSeconds, [FUploadMatchDataSignature](API\Plugins\OnlineSubsystem\Interfaces\FUploadMatchDataSignature) EndTurnCallback )